Battery cell and battery pack

Abstract

The utility model discloses a single battery and a battery pack, the single battery comprises a shell, a battery pack, a battery pack and a battery pack, the shell is internally provided with an accommodating cavity; the pole group is arranged in the accommodating cavity, and tabs are arranged at the two ends of the pole group in the length direction; the cover plate assemblies are arranged at the two ends of the shell in the length direction, gaps are formed between the cover plate assemblies and the end portions of the pole sets, the pole lugs are arranged in the gaps in a folded mode, the cover plate assemblies are fixedly connected with the pole lugs, and the cover plate assemblies are electrically connected with the pole lugs. According to the battery monomer disclosed by the utility model, the tabs are arranged in a folding manner and are electrically connected with the cover plate assembly, so that the internal space utilization rate of the battery monomer is improved, the volume energy density of the battery monomer is improved, the cost of the battery monomer is reduced, and the weight of the battery monomer is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a battery monomer and a battery pack. Background Art

[0002] Relevant technologies point out that existing blade structures have high costs and low internal space utilization, and are unable to meet the market's increasingly higher demands for battery energy density. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery cell with a simple structure and high energy density.

[0004] The utility model also provides a battery pack having the battery monomer.

[0005] The battery cell according to the first aspect of the utility model comprises: a shell having a accommodating cavity formed therein; a pole group, the pole group being arranged in the accommodating cavity, and having pole ears at both ends of the pole group in the length direction; a cover plate assembly, the cover plate assembly being arranged at both ends of the shell in the length direction, and a gap being formed between the cover plate assembly and the end of the pole group, the pole ear being folded and arranged in the gap, the cover plate assembly being fixedly connected to the pole ear, and the cover plate assembly and the pole ear being electrically connected.

[0006] According to the battery cell of the utility model, the tabs are folded and electrically connected to the cover plate assembly, thereby improving the internal space utilization of the battery cell, increasing the volume energy density of the battery cell, reducing the cost of the battery cell, and reducing the weight of the battery cell.

[0007] In some embodiments, the cover plate assembly includes a plain aluminum plate, a connecting block is provided on the plain aluminum plate, and the electrode tab is electrically connected to the connecting block.

[0008] In some embodiments, the cover plate assembly includes a plain aluminum plate, a convex bump is formed on the plain aluminum plate, and the electrode ear is electrically connected to the convex bump.

[0009] In some embodiments, the battery cell further includes: an explosion-proof valve, wherein the explosion-proof valve is disposed on the bare aluminum plate, and / or the explosion-proof valve is disposed on the shell.

[0010] In some embodiments, a liquid injection port is formed on the plain aluminum plate, and the liquid injection port penetrates the plain aluminum plate in the thickness direction of the plain aluminum plate, and / or a liquid injection port is formed on the shell, and the liquid injection port penetrates the peripheral wall of the shell in the thickness direction of the peripheral wall of the shell.

[0011] In some embodiments, the battery cell further includes: a positive terminal plate, wherein the positive terminal plate is disposed between the cap plate assembly and the electrode group.

[0012] In some embodiments, the positive terminal plate is integrally formed.

[0013] In some embodiments, the battery cell further includes: a side plate, wherein the side plate is disposed on at least one side in the width direction of the electrode group.

[0014] In some embodiments, the battery cell further includes: a lower plastic, the lower plastic is disposed at the negative end of the electrode group, and the lower plastic is integrally formed.

[0015] A battery pack according to a second aspect of the present invention comprises a plurality of battery cells according to the first aspect of the present invention.

[0016] According to the battery pack of the utility model, by providing the battery cells of the first aspect mentioned above, the internal space utilization of the battery pack is improved, the volume energy density of the battery pack is increased, the cost of the battery pack is reduced, the weight of the battery pack is reduced, and thus the overall performance of the battery pack is improved.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the utility model;

[0019] Figure 2 yes Figure 1 A schematic diagram of another perspective of the battery cell shown in ;

[0020] Figure 3 yes Figure 1 A schematic diagram of the positive electrode cover shown in ;

[0021] Figure 4 yes Figure 1 A schematic diagram of the negative electrode cover shown in ;

[0022] Figure 5 yes Figure 4 A schematic front view of the negative electrode cover shown in FIG.

[0023] Figure 6 yes Figure 5 Schematic diagram of the AA section shown in;

[0024] Figure 7 is a schematic diagram of a battery cell according to another embodiment of the utility model;

[0025] Figure 8 yes Figure 7 A schematic diagram of the negative electrode cover shown in ;

[0026] Fig. 9 yes Figure 7 A schematic diagram of the positive terminal plate shown in ;

[0027] Fig.10 yes Figure 7 Schematic diagram of the positive electrode cover shown in .

[0028] Reference numerals:

[0029] 100. Battery cell; 1. Shell; 2. Pole group; 21. Pole ear; 3. Cover assembly; 31. Plain aluminum plate; 32. Positive cover; 33. Negative cover; 4. Positive terminal plate; 5. Side plate; 6. Positive top patch; 7. Negative top patch; 8. Sealing nail; 9. Sealing aluminum nail; 10. Blue film; 11. Mylar film. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] Reference below Figure 1-Figure 10 A battery cell 100 according to an embodiment of the first aspect of the present invention is described.

[0032] like Figure 1 As shown, the battery cell 100 according to the first embodiment of the utility model includes: a shell 1, a pole group 2 and a cover plate assembly 3.

[0033] Specifically, a housing 1 is formed with a housing cavity, the pole group 2 is disposed in the housing cavity, the pole group 2 has pole ears 21 at both ends in the length direction, the cover assembly 3 is disposed at both ends in the length direction of the housing 1, and a gap is formed between the cover assembly 3 and the end of the pole group 2, the pole ear 21 is folded and arranged in the gap, the cover assembly 3 is fixedly connected to the pole ear 21, and the cover assembly 3 is electrically connected to the pole ear 21. As a result, the battery cell 100 has a simple structure, a clever design, and a compact internal structure.

[0034] According to the battery cell 100 of the embodiment of the utility model, the pole ear 21 is folded and arranged and electrically connected to the cover plate assembly 3, so that the internal space utilization rate of the battery cell 100 is improved, the volume energy density of the battery cell 100 is improved, the cost of the battery cell 100 is reduced, and the weight of the battery cell 100 is reduced.

[0035] Furthermore, the cover plate assembly 3 includes a positive electrode cover plate 32 and a negative electrode cover plate 33 .

[0036] In other embodiments of the present invention, the cover plate assembly 3 includes a plain aluminum plate 31, a connecting block is provided on the plain aluminum plate 31, and the tab 21 is electrically connected to the connecting block. Thus, the volume energy density is improved while the production cost is reduced.

[0037] In some other embodiments of the present invention, the cover plate assembly 3 includes a plain aluminum plate 31, a convex bump is formed on the plain aluminum plate 31, and the pole ear 21 is electrically connected to the convex bump. Therefore, the structural functions of the connecting block and the convex bump are the same, both of which are to improve the volume energy density of the battery cell 100, so that the internal structure of the battery cell 100 is compact and the connection is stable, thereby avoiding the movement of the pole group 2 in the housing 1.

[0038] Optionally, the battery cell 100 further includes: an explosion-proof valve, which is arranged on the plain aluminum plate 31, and / or the explosion-proof valve is arranged on the housing 1. Therefore, the explosion-proof valve is designed on the plain aluminum plate 31 or the housing 1, which simplifies the internal structure of the battery cell 100 and improves the volume energy density of the battery cell 100. In addition, the explosion-proof valve can be arranged only on one of the positive and negative aluminum plates 31, 31, or on both the positive and negative aluminum plates 31, or only on the housing 1.

[0039] In some embodiments of the utility model, a liquid injection port is formed on the bare aluminum plate 31, and the liquid injection port penetrates the bare aluminum plate 31 in the thickness direction of the bare aluminum plate 31, and / or a liquid injection port is formed on the shell 1, and the liquid injection port penetrates the peripheral wall of the shell 1 in the thickness direction of the peripheral wall of the shell 1. Specifically, the liquid injection port can be set only on one of the positive and negative aluminum plates 31, or on both the positive and negative aluminum plates 31, or only on the shell 1. As a result, the structural selectivity of the battery cell 100 is expanded, making the battery cell 100 more applicable.

[0040] In some embodiments of the present invention, Figure 1 , Figure 2 or Figure 7 As shown, the battery cell 100 further includes: a positive terminal plate 4, which is disposed between the cap plate assembly 3 and the electrode group 2. Thus, the structure of the battery cell 100 is more compact, which is conducive to reducing the size and volume of the battery cell 100.

[0041] Optionally, the positive terminal plate 4 is integrally formed. In other embodiments, the positive terminal plate 4 may be a split structure.

[0042] In some embodiments of the present invention, the battery cell 100 further includes: a side plate 5, which is disposed on at least one side in the width direction of the electrode group 2. That is, the side plate 5 can be disposed on one side in the width direction of the electrode group 2, or on both sides in the width direction of the electrode group 2. Thus, the battery cell 100 has a simple structure and is easy to produce and assemble.

[0043] In some embodiments of the present invention, the battery cell 100 further includes: a lower plastic, which is disposed at the negative end of the electrode group 2 and is integrally formed. In other embodiments, the lower plastic may be a split lower plastic. Thus, the cost of the battery cell 100 is reduced and the weight of the battery cell 100 is lightened.

[0044] The following will refer to Figure 1-Figure 10 A battery cell 100 according to a specific embodiment of the present invention is described.

[0045] Reference Figure 1-Figure 10 The battery cell 100 includes a positive electrode top patch 6, a negative electrode top patch 7, a positive electrode cover plate assembly 3, a negative electrode cover plate assembly 3, a sealing glue nail 8, a sealing aluminum nail 9, an electrode group 2, a positive terminal plate 4, a shell 1, a blue film 10, a side plate 5 and a mylar film 11.

[0046] Specifically, the positive electrode ear 21 is directly connected to the bare aluminum plate 31 of the positive electrode cover plate assembly 3, which can be connected by welding. The positive electrode cover plate 32 is not designed with components such as poles, lower plastic, sealing rings, and upper plastic. A positive electrode connecting block is designed on the negative electrode bare aluminum plate 31. The connection can be formed by the bare aluminum plate 31 itself through stamping or the like, or it can be welded to the negative electrode bare aluminum plate 31. The positive electrode connecting block may not be designed on the bare aluminum plate 31, and the positive electrode bare aluminum plate 31 acts as the positive electrode and the negative electrode bare aluminum plate 31 acts as the negative electrode.

[0047] The battery pack according to the second embodiment of the present invention includes a plurality of battery cells 100 according to the first embodiment of the present invention.

[0048] According to the battery pack of the embodiment of the utility model, by providing the battery cell 100 of the first embodiment, the internal space utilization of the battery pack is improved, the volume energy density of the battery pack is increased, the cost of the battery pack is reduced, the weight of the battery pack is reduced, and thus the overall performance of the battery pack is improved.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0053] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: A housing is formed with a receiving cavity. A pole group, the pole group is arranged in the accommodating cavity, and the two ends of the pole group in the length direction have pole ears, A cover plate assembly is arranged at both ends of the shell in the length direction, and a gap is formed between the cover plate assembly and the end of the pole group, the pole ear is folded and arranged in the gap, the cover plate assembly is fixedly connected to the pole ear, and the cover plate assembly and the pole ear are electrically connected.

2. The battery cell according to claim 1, characterized in that: The cover plate assembly comprises a plain aluminum plate, a connecting block is arranged on the plain aluminum plate, and the pole ear is electrically connected to the connecting block.

3. The battery cell according to claim 1, characterized in that: The cover plate assembly comprises a plain aluminum plate, a convex bump is formed on the plain aluminum plate, and the electrode ear is electrically connected to the convex bump.

4. The battery cell according to claim 2 or 3, characterized in that: Also includes: An explosion-proof valve is arranged on the bare aluminum plate, and / or the explosion-proof valve is arranged on the shell.

5. The battery cell according to claim 4, characterized in that: A liquid injection port is formed on the plain aluminum plate, and the liquid injection port penetrates the plain aluminum plate in the thickness direction of the plain aluminum plate, and / or a liquid injection port is formed on the shell, and the liquid injection port penetrates the peripheral wall of the shell in the thickness direction of the peripheral wall of the shell.

6. The battery cell according to claim 5, characterized in that: Also includes: A positive terminal plate is disposed between the cover plate assembly and the electrode group.

7. The battery cell according to claim 6, characterized in that: The positive terminal plate is integrally formed.

8. The battery cell according to claim 7, characterized in that: Also includes: A side plate is provided on at least one side of the electrode group in a width direction.

9. The battery cell according to claim 8, characterized in that: Also includes: The lower plastic is arranged at the negative end of the electrode group, and the lower plastic is integrally formed.

10. A battery pack, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 9.

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